Pneumatic rock-drilll.



C. J. SMITH. PNEUMATIG ROOK DRILL. APPLIoATIoN FILED MAY 29, 1913. 1 1 l9, 1 98.

Patented Dec. 1, 1914.

' STATES PATENT OFFICE# v CLAK siai'rH, or or'iiuMwA, IOWA.

` rnnnnarrc nook-DRILL.

specification f Letters Patent. Patented Dec. 1, 1914. originalapplication inea april 7, 1913, serial No. 759,538. Divided and thisapplication filed nay 29, 1913.

Serial No. `770,586.

To allwhomc't may concern: n n n Be it known that I, CLARKJ. SM1TH',.residingl at Ottumwa,in` thecounty of Wapello and State .of Iowa, 'have 1invented certain new and useful Improvements in Pneumatic Rock-Drills,

speciiication'.

This invention, which relates .toimprove- :mentsin rock-drills, is `morekespecially in the natureof a pneumatically actuated rotating attachmentfor Apneumatic drills of the hammer type and more especially adapted fordrilling coal rock and any hardminingsubstance. l

`In pneumatic rock drilling machines now ingeneral use, where avreciprocating hammachine being shown in the accompanying` mer fpiston,by rapidly successive blows, drives the drill bit farther intothesubstance being drilled, constant turning of the drill,

is necessary so that the cutting or pene tratingportions on the end 'ofthe drill ydo notv strike on `the same indentations, `which usuallycauses either a combination fand novel arrangement of the parts,yhereinafter fully" described, specifi#A i .cally pointed out in theappended claims and illustrated in in which: i A.

Figure l-is` a longitudinal section, `partly in elevation, of apneumatic rock `drill-.ham-v Qthe, accornpanyingv drawings,

mer showing my` appliance attached thereto.v Fig. 2 is an enlargedsection on line 2-2 on` rying and actuatingblock piston.' Fig. 6 isv aperspective view partly in section of the precipitating air valve.` i iInthe practicaly application of mypresent invention my improved`attachmentsl areadapted for being mounted upon and combined with ahand'machine in which is included a pneumatically actuated i drivingmember or hammer, such a general typeof drawings in vwhicha designatesthe handle that carries the -i Athe position shown'in Fig. 2, valve port4 casing b, in which is located a pneumatic `ofwhich the following is avpoor cutting or drill- `ing or none atall. f v

My invention "primarily seeks to provide certain improvements in rockdrills, of the general type stated of asimple and practicalkconstruction and withthat and other objects- -in view myinventionconsists ofthe peculiar hammer or plunger o of any approvedtype, the front end of thesaid casing having `the vusual passage for thebutt end of they drill e.

Referring now more particularly `to `my improvedattachments, the sameincludes a main `frame l,\that is attached to and is f mounted on thefront end of the casing b and disposed transversely thereof` whereby tobring a forwardly extended apertured hub portion l5 of the said frame inlongi#` tudinal alinement with the drill shank pas` sage inthe-casing b.i The framing 1 also includes a cylinder 16, the opposite ends of whichare formed with laXial sockets 17e-17 forfreceiving the opposite endscfa shiftable vvalve 3 `on which is loosely mounted a piston 2, providedwith a central annular grooveQO, for receiving the `projecting lug 60 oflthe shiftable or ratchet block 6, presently again referred to.

17a designates a main inlet` for the working fiuid, and the same islocated centrally over thejworking cylinderdand it communi'- ,cates withthe opposite ends ofthe said cyl# inder through thee iuidV passages '18.

VValve 3, before referred to, is in the nature cfa central shaft for thepiston, its op-1" positeends projecting into the sockets at the oppositeends of theworking cylinder and each` of lthe'saidends has an inletD10-30y that connects, "through the ports or chan.-`

nels y3l with the inlet ports 1 -tain the opposite ends of the cylinder.Valve 3 `at each endy has anvannular Huid passage 33 and 'eachrifof the.passages `Sconnects with a v longitudinal fluid passage,A 311-134,thateX- tends .over nearly tothe otherI end of the valve and the end` ofeach of the passages 34` terminates in a radial` outlet 35, that opensinto the working cylinder or chamber, asis best shown in` Fig. v2 of thedrawing, by i reference to which it will be also seen each end of thevalve has another annular grooye 36-36 that forms passages for the iuld1oov `passing from the'l main inlet to `andithrough lthel'ateral fluidpassages to the working cyli; direction. v

opens vwhich allowsthe fluid to pass to 'the` rightlhand end of thevalve 3, (seeF to force the said valve 3 back tothe position shown inthe said Fig. 2, thereby bringingfthe fluid passage from the main inletinto open communication with the `working cylinder at theright handendof the piston Y' and the'other end ofthe cylinder into opencommunication with theexhaust.

l Both ends of the cylinder and the ,valve are alike and hence after theaction just eX plained has taken place 'underithel movementsof thepiston. in one direction, a like` actiontakes place at the other end byreason ofthe movement of the piston inthe kother Since the piston andthe valve travel the v sameiway, it is evident that should there be anylfriction on the piston or the valve, it will assistinholding the valveopen to its .'fwork.k ,v -V l 4 p i vForturning the drill, I prefer touse the ratchet mechanism shown and the same includes a ratchet sleeveor bushing 8 thatv turns in the hub ofthe main framing and` in kwhichthe drill shank is slidably held.

Theratchet block 6 before referred to is `reciprocably Yheld in a socket61 in the framingand it carries` a drop-pawl l0 that-en- `gages'theratchet' at one side, a second pawl of. the lever.9is projected in thepath of movement of the ratchet block 6 and isso n disposed that as' thesaid block is carried forwardly with the'pist'on 2 (seevarrow the .saidblock engages the lever 9 and thereby throws the pawl 12 to turn the'ratchet with the drill in the directionindiycated by the arrow 'iit'being obvious vfrom the drawing that as' thelblock 6`is moved in theother direction its pawl 10 engages and moves thefratchet 8 in the samedirectioinj the reciprocable movement of the "block 6' underlthereciprocating actions of the piston imparts a continuous rotary travelto the drill. v f l .To providefor a simple and expedient assembling ofthe valve and*` thepiston, one

end of the piston cylinder casing is plugged,y as at 40, and theplug'held by a cross pin 41."

In this application, I make no claim to the construction of the andthe-connections between v'the 'reciprocating `piston' 2 and the drill eas that forms the subject matter oi' my originalapplication l'ed April7,

1913#759,538, of which original application thepres'ent oneisadivisional part.

From the. 'foregoing takenin .connection :with the drawings, thecomplete' construction, the manner of operati o'n..and` the advantagesof my invention will be readily understood by those skilled in the" artto which'it appertains. p

`VWhatI claimiis :V 1. ,Al fluid operated -jenginexincluding a casinghaving va chamber, said casing having counterbores communicatingat oneend with said chamber, 'a reciprocating piston mounted: in said chamber,a valve 'member projecting through an4 aperture in. said` piston andvprojecting linto said counterbores 'of said casing, and means forshifting. said valve member bythe fluid that operates said piston.v f jf f Y 2. A fluid operated engine including a casing having a chamber',said casing y rhaving' counterbores communicating at one .end with saidchamber, areciprocatingpistonmounted in` said chamber, a valvememberprojecting through an aperture insaid piston. and projecting into saidcounterboresf of said casing, #and means for shifting saidvalve memberbythe fluid thatoperates said piston, said last-'named means yincludingfluid passages-in saidcasing, other iluid passages in said valve membercooperating with said piston and withsaidfcasinglpassages toc01i trolthe action of said valve'member.

` A pneumatic enginey comprising ay casing havingpa piston chamber, apiston in said chamber, 'saidpistonl having a bore, a

eo Y

ineanscoperative with .said piston,tsaid j.

Valve member, and saidcasing chamber for automatically effecting theshifting otlsaid v valve Vmember ac'cordingto the position of l Copiesofthis patent may be obtained for five cents each, by addressing theCommissioner-vof Patents.

Washington, C.

95 valve member lo'ngiti'idinallyl movable in 1 said pistonyborerandjin` saidchamber, rand

